What do the underlined words “peer into” in Paragraph 2 probably mean?

(单选题)What is the main idea of this passage? (单选题)What does the underlined word “this” refer to? (单选题)Which of the following statements is true? (单选题)Which of the following is not the advantage of edible plates (单选题)Which statement best demonstrates that California is a land (单选题)Which of the following is NOT mentioned in the passage as be (单选题)Where is the highest point in the United States located? (单选题)Which of the following is the lowest point in the United Sta (单选题)选择（）。 (单选题)选择（）。